@misc{indiciaeb7a8f99285bf,
  title = {Studies of some unconventional systems for solving various landing problems},
  author = {Leland, T. J. and Mcgehee, J. R. and Dreher, R. C.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810010541},
  note = {Source identifier: 19810010541}
}